What kind of water did you use? I have had a couple bitter batches when I used all tapwater from my house. We have really hard water. I have to change my water chemistry for all my lighter beers. Dark beers are fine.
Other than that I can't see anything obviously wrong - a possible infection I guess.
8-Paws Brewing Co.
Tap 1:.Bombastic IIPA (10g)
Tap 2:.Mudpuddle Oatmeal Stout (10g) [nitro]